Not your regular Sudokus he. You might start with very few digits, or none at all. Instead, each puzzle has its own custom rules — things like consecutive constraints along lines, digits inside cages that must sum to a total, or lines where the first digit equals the sum of the rest.

If you'd like to try them, here's two puzzles I created myself :)

• https://sudokupad.app/dn567rb7ts
• https://sudokupad.app/p590cio2g2 (featured by CTC)

Watch me solve one:

• https://www.youtube.com/watch?v=flfsCg24-1U

And here is a list of puzzles arranged from (what I believe are) the easier ones to the more challenging:

• https://sudokupad.app/3jdlbq25sj
• https://sudokupad.app/BtghmrqfDb
• https://sudokupad.app/iwfv5d36aw
• https://sudokupad.app/2ovb2c69ua
• https://sudokupad.app/vo44xbbb7i
• https://sudokupad.app/gjwn9e0c5u
• https://sudokupad.app/fpr5yllxfe